Ref: your posting of Sat, 05 May 2007 00:30:45 -0400
In support of Computer History Museum applications, a colleague (Hans Pufal) is building an AWK program set that we will use under Linux for replacing duplicate files in a hierarchical directory with links to a single remaining original.  I believe that Hans has in mind making these programs available freely.  They might be what you are seeking.

It will be a short while before Hans work is tested and available.  Before that, we have to figure out how to bypass what seems to be a Greenstone "service"--replacing symbolic links with file copies as part of building a library!

Cheerio, Henry
 
H.M. Gladney, Ph.D.  http://home.pacbell.net/hgladney